Extend Windows Server 2019 RDS Licensing Server

If your RD Licensing Server has got expired you may want to increase the time to use Remote Desktop Connections for Windows Server 2019. An RD Licensing server is required for continuous operation. A Remote Desktop Session Host server can operate without a license server for 120 days after the initial start-up.

To do that simply run bellow script in your RDS server within PowerShell of your Windows 2019 Server. The script is interactive and will tell you how many days are left (very handy as you can look it up extremely quickly this way) and lets you choose if you want to reset the time or not.


## RESET RDP SERVER GRACE PERIOD ---> Run bellow code in Powershell

## This Script is intended to be used for Querying remaining time and resetting Terminal Server (RDS) Grace Licensing Period to Default 120 Days. 
## Developed by Prakash Kumar (prakash82x@gmail.com) May 28th 2016 
## www.adminthing.blogspot.com 
## Disclaimer: Please test this script in your test environment before executing on any production server. 
## Author will not be responsible for any misuse/damage caused by using it. 

Clear-Host 
$ErrorActionPreference = "SilentlyContinue" 

## Display current Status of remaining days from Grace period. 
$GracePeriod = (Invoke-WmiMethod -PATH (gwmi -namespace root\cimv2\terminalservices -class win32_terminalservicesetting).__PATH -name GetGracePeriodDays).daysleft 
Write-Host -fore Green ====================================================== 
Write-Host -fore Green 'Terminal Server (RDS) grace period Days remaining are' : $GracePeriod 
Write-Host -fore Green ======================================================   
Write-Host 
$Response = Read-Host "Do you want to reset Terminal Server (RDS) Grace period to Default 120 Days ? (Y/N)" 

if ($Response -eq "Y") { 
## Reset Terminal Services Grace period to 120 Days 

$definition = @" 
using System; 
using System.Runtime.InteropServices;  
namespace Win32Api 
{ 
    public class NtDll 
    { 
        [DllImport("ntdll.dll", EntryPoint="RtlAdjustPrivilege")] 
        public static extern int RtlAdjustPrivilege(ulong Privilege, bool Enable, bool CurrentThread, ref bool Enabled); 
    } 
} 
"@  

Add-Type -TypeDefinition $definition -PassThru 

$bEnabled = $false 

## Enable SeTakeOwnershipPrivilege 
$res = [Win32Api.NtDll]::RtlAdjustPrivilege(9, $true, $false, [ref]$bEnabled) 

## Take Ownership on the Key 
$key = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey("SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod", [Microsoft.Win32.RegistryKeyPermissionCheck]::ReadWriteSubTree,[System.Security.AccessControl.RegistryRights]::takeownership) 
$acl = $key.GetAccessControl() 
$acl.SetOwner([System.Security.Principal.NTAccount]"Administrators") 
$key.SetAccessControl($acl) 

## Assign Full Controll permissions to Administrators on the key. 
$rule = New-Object System.Security.AccessControl.RegistryAccessRule ("Administrators","FullControl","Allow") 
$acl.SetAccessRule($rule) 
$key.SetAccessControl($acl) 

## Finally Delete the key which resets the Grace Period counter to 120 Days. 
Remove-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod' 

write-host 
Write-host -ForegroundColor Red 'Resetting, Please Wait....' 
Start-Sleep -Seconds 10  

  } 

Else  
    { 
Write-Host 
Write-Host -ForegroundColor Yellow '**You Chose not to reset Grace period of Terminal Server (RDS) Licensing' 
  } 

## Display Remaining Days again as final status 
tlsbln.exe 
$GracePost = (Invoke-WmiMethod -PATH (gwmi -namespace root\cimv2\terminalservices -class win32_terminalservicesetting).__PATH -name GetGracePeriodDays).daysleft 
Write-Host 
Write-Host -fore Yellow ===================================================== 
Write-Host -fore Yellow 'Terminal Server (RDS) grace period Days remaining are' : $GracePost 
Write-Host -fore Yellow ===================================================== 

## Cleanup of Variables 
Remove-Variable * -ErrorAction SilentlyContinue

## https://mangolassi.it/topic/19353/reset-120-day-grace-period-for-windows-rds-server-with-powershell